Federalsburg is a town in Caroline County, Maryland, United States. The population was 2,642 at the 2009 census. The ZIP code is 21632. The primary phone exchange is 754 and the area code is 410.
Claims to fame include a Federalist Party meeting in the early 19th century that gave the town its name and also being host to three Eastern Shore Baseball League minor league teams – the Athletics, Little A's, and Feds.
The town is the home of the radio station WTDK also known as THE DUCK.